I recently moved my website to a new server.
This is a one page website with a mainly a contact form using an invite.php email form
Since I moved to the new server, everytime the user inputs his name and email it returns this page:
Notice: Undefined variable: HTTP_POST_VARS in /home/xxx/public_html/landing/invite.php on line 19 Notice: Undefined variable: HTTP_POST_VARS in /home/xxx/public_html/landing/invite.php on line 20 Notice: Undefined variable: HTTP_POST_VARS in /home/xxx/public_html/landing/invite.php on line 24

Here is the invite.php file.

Would you have any idea what is wrong? I am using PHP 5.3.2.
Many thanks in advance for your feedback